Help! HOW to put on DIAGNOSTIC MODE X2?

Hello, well just got a X2 but i wanna put on DIAG MODE like the X (power off, hold camera botton while turning power On) but in the new X2 there is no CAMARA Button so? how can i put it in DIAGNOSTIC MODE, i need to use QPST and with de diag mode i get a port number but i really dont know how put it in de X2 can some body help me pleasee!!!!!???